1.4.0

CHANGES:

• Add ?here and ?pos arguments to the test assertion functions. These can be
  used to pass information about the location of the call-site, which is
  displayed in failing test output. (#291, @craigfe)

• Add a pretty-printer for the exception raised by Alcotest.check and related
  functions. This allows them to be used outside of an Alcotest test runner for
  making general assertions. (#296, @craigfe)

• Add --bail option (and corresponding ALCOTEST_BAIL environment variable),
  which causes Alcotest to terminate after the first test failure. (#298,
  @craigfe)